Depends on the kit - Promega's wizard kits had diatomaceous earth (essentially silicon dioxide) as the filter, but other kits use formulations of glass. I don't know if there are any that use cellulose acetate, but there could well be.

Depends on the kit - Promega's wizard kits had diatomaceous earth (essentially silicon dioxide) as the filter, but other kits use formulations of glass. I don't know if there are any that use cellulose acetate, but there could well be.